code: def test_reg_cv_permutation_importances(regression_explainer_with_cv):
      assert isinstance(
          regression_explainer_with_cv.permutation_importances(),
          pd.DataFrame,
      )
      assert isinstance(
          regression_explainer_with_cv.permutation_importances(
              pos_label=0
          ),
          pd.DataFrame,
      )
  
file_path: explainerdashboard/tests/test_cv.py
imports: import pytest
  import pandas
  from explainerdashboard.explainers import ClassifierExplainer, RegressionExplainer
  from explainerdashboard.datasets import titanic_survive, titanic_fare
label_desc: Use image node_id 5 for calling a global function with example usage: test_reg_cv_permutation_importances(regression_explainer_with_cv) without return types